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Vertical Radiator Bars Always Cold When Heating is on

Posted: Sun Oct 01, 2017 12:33 pm
by Mypig7
I have a vertical radiator in my bathroom. The bars are always cold when the heating is on.

I have switched off all other radiators in the house, used my key to undo the radiator and put heating on.

Bottom 5 bars out of the 25 are hot rest are cold.

Any ideas?